Thomas j



(No Model.)

T. J. MOTIG-HE & J. T. MQOONNELL.

GOMMUTATOR FOR DYNAMO ELEGTRIG MACHINES.

No. 288,830. Patented Nov. 20. 1883.

[NVENTORJ ATTORNEI J,

I 5 provement.

2o necting the strips and segments.

5 lector.

UNITED STATES PATENT Orricn.

THOMAS J. MCTIGHE AND JOSEPH T. MCGONNELL, OF PITTSBURG, PA.

COMMUTATOR FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 288,830, dated November 20, 1883,

Application filed July 14, 1883.

5 sylvania, have invented certain new and useful Improvements in Oommutators for Dynamo- Electric Machines; and we do hereby declare that the following is a full, clear, and exact description of the invention,which will enable to others skilled in the art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, which form a part of this specification in which Figure l is alongitudinal section of our im- Fig. 2 is an end view of one segment complete. Fig. 3 is a side view of one segment. Fig. 4 is asimilar view of a modification. Figs. 5 and 6 are respectively end and side views of the preferred form of con- Fig. 7 is a front view of one of the rings of insulating material.

This invention relates to anovel construction of commutators or collectors for magneto or 25 dynamo electric machines and electric motors,

whereby the cost is reduced and great facility secured for mounting and dismounting all or any of the parts and connecting them to the armature-wires.

The invention consists in the construction, arrangement, and combination of parts, as hereinafter fully described and claimed.

A designates the shaft of the machine, having shoulder a and screw-thread Z), adapted for 3 5 the reception of the nut O and jam-nut D.

Upon shaft A we fit the two metallic rings 6 6, both having on the adjacent faces arecess in which are fitted the rings f, of suitable insulating material-such, for instance, as vul- 40 canized fiber, gelatinized fiber, or hard rubber.

These rings have their projecting surfaces preferably convex, as in Fig. 1, and are radially grooved, there being as many grooves g in each ring-face as there are to be segments in the col- These grooves g are made with the sides of each parallel for the reception of the collector-bars. These bars h are cut from a length of rolled or drawn copper strip having a wedgeshape in cross-section. After cutting 50 off square, the bars 71 are subjected to the ac- (No model.)

tion of milling at each end, thus shaping them to form the semicircular rabbets '1', with the tongues 7c. The tongues k are made of a thickness to fit closely in the grooves g of the rings f, and the rabbets 2' correspond in radius to the curvature of the faces of said rings. A simple mode of fitting together is to set the shaft A or a corresponding mandrel ina vertical position, then set the ring 6 and ring f on the shaft. Then the collector-bars hare placedby inserting the tongue 7.: at one end of each into one of the radial grooves g of ring f. lVhen all are set in this manner, the ring 0 is set on the shaft, with its insulator-ring f facing to ward the bars 71. The latter are guided into the grooves g of ring f, and when all are seated the nut G is screwed down against ring 0, forcing the'rings ff tightlyinto the rabbets in the bars 71, and securing the latter effectually against motion in any direction whatever. The jam-nut D may then be applied to lock nut 0, though it is not essential if the direction of revolution be offset by the character of the thread of the shaft and nut B. By this construction the collector is simple and cheap and can be readily put together, repaired, or replaced.

Obviously insulating-strips between the bars 71 are not essential, as no lateral movement can take place, owing to the tongue-and-groove form of mounting. Nevertheless, if desired, the usual insulating-plates may be inserted, being in such case stamped with concave end recesses to fit the rings 1' f more or less accurately.

To provide for connections to the armature we proceed as follows: Instead of attaching the wires directly to the commutator, we mill out the ends of the bars h and insert and rivet the strips m, which then take the place of the tongues k. This milling may be done in the middle, as in Fig. 2, or at the side, as in Fig. 5, (in which latter case the other end of the bar will be milled to correspond.) The strips mare firmly attached to bars h by riveting, upsetting, or other mode of attachment. At the other end of the strips on we attach, by rivets or otherwise, the L-shaped chucks a, having each the slit 0, and threaded to receive the compressing-sleeves 1), which are adapted for I00 the reception of a wrench. By having the slitted end projecting, as in Fig. 1, the armature-wires 8 may be brought into the slit 0 laterally to avoid bending, and then the sleeve 1) is screwed up and the wires .9 tightly secured. By this means the wires 8 are not bent, flattened, or liable to become broken in detaching them, and a good electrical connection is secured without soldering.

When the rings f f are large and stiff, the metal rings 0 0 may be found unnecessary.

The mere form of rabbet made in bars h is not essentially circular, as any form which will prevent radial movement of the bars may be adopted. We prefer the circular form, as most conveniently made.

WVe claim as our invention 1. In a commutator, the combination of the radially-grooved rings ff, of insulating material, metallic bars h, having rabbets i and tongues 75, and suitable means for drawing said rings toward each other, substantially as described.

2. In a commutator, the combination of the annularly-grooved metallic plates or rings 6 e, radially-grooved insulating-ringsff, bedded in said rings 6 e, metallic bars h, having the rabbets i and tongues k, and means for clamping the whole longitudinally, substantially as described.

3. A commutator composed of two insulating-rings having their adjacent faces convex and radially grooved, a series of interposed metallic bars having their ends rabbeted to fit the faces of said rings, and provided "with tongues to enter said radial grooves, and suitable means for clamping said rings against the bars, substantially as described.

4. In a commutator, the combination, with the radially-grooved insulating-ring f, of the rabbeted bars 71 and the radial connectingstrips m, attached to said bars 71, and their inner ends constituting tongues k, adapted to fit the radial grooves in ring f, substantially as described.

5. In a commutator, the combination, with its radial strips or, of the threaded chuck it, having slit 0, and the threaded sleeve 1), sub stantially as described.

In testimony that we claim the foregoing as our own we have hereto affixed our signatures in presence of two witnesses.

THOMAS J. MOTIGHE. JOSEPH T. MCCONNELL.

XVitnesses:

THOMAS J. PATTERSON, W. J. MOTIGHE. 

